Writing instrument



April 25, 1950 .E. E. SCHIESEL. 2,505,211

WRITING INSTRUMENT Fiid July 11, 1946 7 2,4 x Z i i z QZL .10

E/fW/V E. 32/115854.

INVENTOR.

Patented Apr. 25, 1950 WRITING INSTRUMENT Ervin E. Schiesel, Meriden, Conn., assignor to Premium Merchandising Corporation, New

York, N. Y.

Application July 11, 1946, Serial No. 682,784

2 Claims. (Cl. 120-424) The present invention relates to improvements in writing instruments, that is, to a type in which a rotatable ball is employed to distribute the adhesive ink paste to the surface written upon, one object of the invention being the provision of a novel form of vent which permits the admission of air to replace ink used in writing. Such vent also will act as a trap which will tend to prevent any ink from leaking out of the cartridge.

In order that the present invention may be fully understood attention is invited to the accompanying drawings in which- Figure 1 is a longitudinal section of a cartridge carrying the ball nib.

Figure 2 is an enlarged detailed sectional view of the vent end thereof.

Figure 3 is a section on line 3-3 of Figure 1.

' Figure 4 is a top plan view of the cartridge.

Referring to the drawings- The numeral l designates a cylindrical open end cartridge which normally delivers ink through a feeder 2 to a rotatable ball 3 by capil-- lary action.

Many methods and devices have been employed to permit air to enter at the enlarged open end of the cartridge, that is, the end remote from the feeder 2, but it has been found that if a plug 4, as here shown, is forced fit into the enlarged end of the cartridge, after the same has been filled with the adhesive ink paste, that a proper admission of the air is permitted with no undue leakage of the ink from the cartridge at this point. This member 4, as clearly shown in Figures 1 and 2, includes a lower member 5 and an upper member 6 having respectively external screw threads I and 8, which thus provide circuitous passages 9 and 9 thereabout and within the adjacent portion of the cartridge. These portions 5 and 6 being connected by a reduced cylindrical portion II which thereby provides an annular chamber l within the cartridge between the members and 5.

Thus it will be seen that as the ink is withdrawn by the ball, that air will be admitted into the space 9' and chamber [0 and space 9 while on the other hand should the ink tend to ooze or pass through the circuitous passage 9, due to the expansion of the ink body or its having become more fluid due to temperature changes, it will have to enter the annular chamber [0 before it enters the spiral space 9', thus providing a multiple safety against'leakage.

It is apparent that the opposite construction may be employed here as an alternate, that is, that the adjacent portion of the cartridge may have internal threads while the member 4 will have no threads but will have the two enlarged portions and the connecting smaller portion, in which event channels similar to the respective channels 9 and 9 and the chamber [0, will result.

What is claimed, is:

1. In a ball nib pen, a cartridge having an open end, and a relatively short spool shaped plug fittin in the open end and providing two spiral air vent passages one at each end of the plug and with an intermediate annular chamber into which both spiral passages communicate.

2. A ball nib pen, including a cylindrical cartridge having a smooth bore open at one end, a ball point member in the opposite end, and a plug for the open end frictionally fitted therein and provided with two separated screw threaded portions, the portion separating the threaded portions being of a lesser diameter, each threaded portion together with the contiguous portion of the wall of the cartridge constitutes a spiral passage, one of the passages which leads from the inner ink filled portion of the cartridge to the annular chamber formed by the lesser diametered portion of the plug, and the other of which spiral passage leads from such lesser diametered portion to the outside air.

ERVIN E. SCI-HESEL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,957,828 Greenwald May 8, 1934 2,151,682 Burkey Mar. 28, 1939 2,263,644 Pierce Mar. 25, 1941 2,323,115 Bryant June 29, 1943 2,397,229 Biro Mar. 26, 1946 2,405,381 Van Spankeren Aug. 6, 1946 

